The rumours were confirmed when one of Jessieâs fans, or âheartbeatsâ as she calls them, tweeted: âWOW @jessiejofficial appearing on UK XFactor as guest mentor with Tulisa?!?â to which the Price Tag singer replied: âyeeaahh man!âJessie, real name Jessica Cornish, will replace Tinie Tempah who had to drop out of being Tulisaâs aid to work on his next album in the US.He confirmed: âIâm not going to be here for that [X Factor] but really wanted to do it. I was meant to be with Tulisa.âLouis Walsh will be ‘lumbered’ with 80s popstar Sinitta , Simon Cowellâs former guest judge, while Kelly Rowland is thought to be lining up either Usher or P Diddy.Gary Barlow, meanwhile, will be joined by Take That bandmate Robbie Williams, who has revealed how excited he is to be working on the show and praised Barlowâs competitiveness.